MKV to VTT
Extract the subtitles inside an MKV file as WebVTT for web players, without uploading the video.
How it works
- 1
Drop one or more files into the box above.
- 2
Pick the output format (already chosen on dedicated pages).
- 3
Download each file or everything as a ZIP. Nothing is uploaded.
Frequently asked questions
Is MKV to VTT free?
Yes. Every tool on FastSub AI is free, with no sign-up, no watermark and no usage limits.
Are my files uploaded anywhere?
No. Your files are read and processed inside your browser tab. The only downloads are the app itself and, for AI tools, the model files.
Which subtitle formats are supported?
SRT, WebVTT, ASS/SSA, SBV, SUB (MicroDVD), SAMI, TTML/DFXP, LRC and CapCut projects in; all of those plus TXT, CSV, JSON, FCPXML, Word and PDF out.
Is there a file size limit?
Subtitle files up to 20 MB and videos up to several GB, limited only by your device's memory.
Related tools
- Universal Subtitle ConverterConvert subtitles between SRT, VTT, ASS, SBV, SUB, SMI, TTML, LRC, TXT, CSV, JSON, Word and PDF.
- Extract Subtitles from VideoPull embedded subtitle tracks out of MKV, MP4 and MOV files and save them as SRT or any other format. Image subtitles are read with OCR.
- CapCut to SRT ConverterConvert CapCut project (CapCut) subtitles to SubRip (SRT) for free, right in your browser. No upload, no sign-up.
- Text to SRTTurn plain text into timed subtitles. Each line becomes a cue, timed by reading speed.
- AI Subtitle GeneratorGenerate timed subtitles from any video or audio with Whisper AI, running privately in your browser.
- Free TikTok CaptionsAuto-generate animated word-by-word captions for TikTok, Reels and Shorts, then burn them into your video. Free, no watermark, no upload: the AI runs in your browser.